Remove check-locales.pl

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The Mozilla Toolkit is a set of APIs, built on top of Gecko, which provide advanced services to XUL applications. These services include Profile Management, Chrome Registration, Browsing History, Extension and Theme Management, Application Update Service, and Safe Mode. (More info)

This is no longer used by Firefox and bugs have been filed for all other apps to remove their usage when it is no longer needed. There is no rush to remove this file... just general cleanup when its usage is no longer needed.